CN102721429A - Frequency-output temperature and humidity transmitter - Google Patents
Frequency-output temperature and humidity transmitter Download PDFInfo
- Publication number
- CN102721429A CN102721429A CN2012102073262A CN201210207326A CN102721429A CN 102721429 A CN102721429 A CN 102721429A CN 2012102073262 A CN2012102073262 A CN 2012102073262A CN 201210207326 A CN201210207326 A CN 201210207326A CN 102721429 A CN102721429 A CN 102721429A
- Authority
- CN
- China
- Prior art keywords
- output
- chip microcomputer
- frequency
- circuit board
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Testing Or Calibration Of Command Recording Devices (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention relates to a frequency-output temperature and humidity transmitter which comprises a shell and a circuit board. The circuit board is arranged inside the shell, a plurality of connecting terminals outputting linear frequency signals are disposed on the shell, a temperature sensor, a humidity sensor, an operational amplifier, a single chip microcomputer and time-base circuits are arranged on the circuit board, the time-base circuits convert linear voltage values into pulse signals, an output end of the temperature sensor is connected with an input end of the operational amplifier, an output end of the operational amplifier and an output end of the humidity sensor are respectively connected with the single chip microcomputer by the time-base circuits, the single chip microcomputer is provided with output pins outputting linear frequency signals, and the output pins of the single chip microcomputer are connected with the connecting terminals. Temperature and relative humidity are measured by the temperature sensor and the humidity sensor, the frequency signals are converted by the single chip microcomputer, and accordingly the temperature and humidity transmitter can output digital signals which can be directly read by computer equipment.
Description
?
Technical field
What the present invention relates to is a kind of technical field of automation, and what be specifically related to is a kind of frequency output humiture transmitter.
Background technology
Sensor is a kind of detecting element; Be also referred to as sensitive element; Can experience measured information, and the information that can detection be experienced, be for conversion into the information output of electric signal or other desired forms according to certain rules; To satisfy requirements such as transmission of Information, processing, storage, demonstration, record and control, it is a primary link of realizing detection automatically and automatic control.
Because sensor generation signal itself is too small and weak and irregular, need further modulate its signal, amplification and linearization process, realizing effective control, the product that sensor is carried out behind the signal condition is called transmitter.
Along with further developing of industrial technology, formed certain standard gradually for the output signal of transmitter, so that with the secondary instrument interface, common several kinds is 0-20mA, 4-20mA, 0-5V, 1-5V, 0-10V etc. are simulating signal.
The humiture transmitter is the temperature of reflection environment and the product of relative humidity data, is usually used in the building automatic control, base station monitoring, the environment control of agricultural greenhouse.
Along with the fast development that China's agricultural modernization is built, the application of agricultural greenhouse and greenhouse technology is more and more extensive.Environmental parameter monitoring and control in greenhouse and booth are to guarantee the requisite factor of the high-quality high yield of crops.Opertaing device in the greenhouse intelligent control system generally adopts computing machine and remote data control system; And conventional humiture transmitter is analog signals on the market; Need to convert into the process of digital quantity through analog quantity, the data that could arrive with the computer interface transmission measurement, this will reduce system compatibility; And the cost of increase equipment, bring certain obstacle for the intelligentized greenhouse technology of popularization.
Summary of the invention
To the deficiency that exists on the prior art, the present invention seeks to be to provide a kind of and can export the digitized signal that can directly be read by computer equipment, i.e. the frequency output humiture transmitter of linear frequency signal output.
To achieve these goals, the present invention realizes through following technical scheme:
Frequency output humiture transmitter; It comprises shell and the circuit board that is provided with in the enclosure; It is characterized in that; Said shell is provided with the connection terminal of a plurality of output line resistant frequency signals; Said circuit board is provided with temperature sensor, humidity sensor, operational amplifier, single-chip microcomputer and converts the linear voltage value time base circuit of pulse signal into, the output terminal concatenation operation amplifier input terminal of said temperature sensor, and the output terminal of said operational amplifier is connected with single-chip microcomputer through time base circuit respectively with the output terminal of humidity sensor; Said single-chip microcomputer is provided with the output pin of output line resistant frequency signal, and the output pin of said single-chip microcomputer connects connection terminal.
Above-mentioned frequency output humiture transmitter wherein, also is provided with buffer circuit on the said circuit board, the output pin of said single-chip microcomputer is connected with connection terminal through buffer circuit.
Above-mentioned frequency output humiture transmitter, wherein, what buffer circuit adopted is the NPN triode.
Above-mentioned frequency output humiture transmitter, wherein, what said temperature sensor adopted is the temperature RTD, what said humidity sensor adopted is humicap.
Above-mentioned frequency output humiture transmitter, wherein, said outer casing bottom is provided with out wire casing and wall hanging mounting hole.
The present invention adopts temperature RTD and humicap to realize the measurement to temperature and relative humidity; Because these two kinds of sensors are output resistance and capacitance respectively; And certain nonlinearity erron is arranged, need convert the linear analogue signal earlier into, carry out the conversion of frequency signal again through single-chip microcomputer; It makes the humiture transmitter can export the digitized signal that can directly be read by computer equipment.
Description of drawings
Specify the present invention below in conjunction with accompanying drawing and embodiment;
Fig. 1 is a shell mechanism synoptic diagram of the present invention;
Fig. 2 is circuit link block figure of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with embodiment, further set forth the present invention.
Referring to Fig. 1 to Fig. 2; Frequency output humiture transmitter of the present invention; It comprises shell 1 and the circuit board 2 that is installed in the shell 1, is provided with a plurality of connection terminals 3 in a side of shell 1, and this connection terminal 3 is the DP9 connection terminal; And be fixed by welding on the circuit board 2, this circuit board 2 is installed in housing 1 inside through nut; The bottom of the shell 1 of present embodiment sets out wire casing 4 and wall hanging mounting hole 5, reaches hiding purpose, makes things convenient for field wiring, makes shell handsome in appearance, process meticulous, wall-hanging installation.
In the present embodiment, this circuit board 2 comprises temperature sensor 21, humidity sensor 22, operational amplifier 23, buffer circuit 26, single-chip microcomputer 25 and the linear voltage value is converted into the time base circuit 24 of pulse signal.What this temperature sensor 21 adopted is the temperature RTD, and what humidity sensor 22 adopted is humicap.The input end of the output terminal concatenation operation amplifier 23 of this temperature sensor 21; The output terminal of the output terminal of said operational amplifier 23 and humidity sensor 22 respectively is connected with single-chip microcomputer 25 through a time base circuit 24 respectively; Said single-chip microcomputer 24 is provided with the output pin of output line resistant frequency signal; The output pin of this single-chip microcomputer connects buffer circuit 26, the connection terminal 3 of output terminal shell 1 outside of this buffer circuit 26.
Present embodiment at first is a conversion of signals in use; Temperature sensor 21 is that the resistance value that the computing amplification circuit is exported temperature sensor 21 converts the linear voltage value into through operational amplifier 23, and under the effect of time base circuit 24, converts pulse signal into; And humidity sensor 22 is directly to pass through time base circuit 24, and the capacitance that humidity sensor 22 is exported converts pulse signal into.
Once more, signals collecting; Carry IO external interrupt function through single-chip microcomputer 25, with the pulse signal acquisition after the above-mentioned conversion to single-chip microcomputer 25, the cycle gathers, and each mode of interrupting increasing progressively is gathered, and is stored in the single-chip microcomputer internal RAM variable and calls for subsequent calculations.
The 3rd, linear calculating; Carry out the nonlinear compensation of humiture through tabling look-up, and calculate the output frequency size.
The 4th, frequency output; Carry the comparison output function of IO through single-chip microcomputer 25, will calculate back gained frequency values and export, directly be connected with outside for preventing single-chip microcomputer 25, it is buffer circuit 26 that the centre is carried out the one-level isolation through the NPN triode as electronic switch.
The detailed process of present embodiment is: with temperature sensor 21, humidity sensor 22 places in circuit, produce the trigger circuit that change with sensor signal, trigger timer; Through the conversion of time base circuit, form irregular, not linear frequency signal; Gathering the back through single-chip microcomputer 25 more further calculates and conversion; The linear frequency signal that output needs connects connection terminals 3 through buffer circuit 26, the digitized signal that can directly be read by computer equipment.
The present invention improves on existing basis; Adopt temperature RTD and humicap to realize measurement to temperature and relative humidity; Because these two kinds of sensors are output resistance and capacitance respectively, and certain nonlinearity erron is arranged, and need convert the linear analogue signal earlier into; Carry out the conversion of frequency signal again through single-chip microcomputer; Make the humiture transmitter can export the digitized signal that can directly be read by computer equipment, i.e. the transmitter of linear frequency signal output, corresponding 0-100 ℃ of its temperature section: kHz-2kHz; The corresponding 0-100RH% of humidity part 1kHz-2kHz; It is simple in structure, reasonable in design, be worth of widely use.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (5)
1. frequency is exported the humiture transmitter; It comprises shell and the circuit board that is provided with in the enclosure; It is characterized in that; Said shell is provided with the connection terminal of a plurality of output line resistant frequency signals; Said circuit board is provided with temperature sensor, humidity sensor, operational amplifier, single-chip microcomputer and converts the linear voltage value time base circuit of pulse signal into, the output terminal concatenation operation amplifier input terminal of said temperature sensor, and the output terminal of said operational amplifier is connected with single-chip microcomputer through time base circuit respectively with the output terminal of humidity sensor; Said single-chip microcomputer is provided with the output pin of output line resistant frequency signal, and the output pin of said single-chip microcomputer connects connection terminal.
2. frequency output humiture transmitter according to claim 1 is characterized in that also be provided with buffer circuit on the said circuit board, the output pin of said single-chip microcomputer is connected with connection terminal through buffer circuit.
3. frequency output humiture transmitter according to claim 2 is characterized in that what said buffer circuit adopted is the NPN triode.
4. frequency output humiture transmitter according to claim 1 is characterized in that what said temperature sensor adopted is the temperature RTD, and what said humidity sensor adopted is humicap.
5. frequency output humiture transmitter according to claim 1 is characterized in that said outer casing bottom is provided with out wire casing and wall hanging mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207326.2A CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207326.2A CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102721429A true CN102721429A (en) | 2012-10-10 |
| CN102721429B CN102721429B (en) | 2015-06-24 |
Family
ID=46947254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210207326.2A Expired - Fee Related CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102721429B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142185A (en) * | 2013-05-10 | 2014-11-12 | 重庆金美通信有限责任公司 | Oil and water temperature collecting circuit for hydraulic retarder |
| CN112557452A (en) * | 2020-12-08 | 2021-03-26 | 安徽信息工程学院 | Combined relative humidity sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357758A (en) * | 2002-01-11 | 2002-07-10 | 东南大学 | Integrated humidity detector with frequency output |
| CN2504671Y (en) * | 2001-07-16 | 2002-08-07 | 复旦大学 | Temp. moisture monitoring circuit device |
| CN2570782Y (en) * | 2002-09-27 | 2003-09-03 | 北京农业信息技术研究中心 | Intelligent humiture self-compensation sensing transducer |
| US20050218465A1 (en) * | 2004-04-02 | 2005-10-06 | Timothy Cummins | Integrated electronic sensor |
| CN201035743Y (en) * | 2007-04-03 | 2008-03-12 | 范良凯 | Humiture transducer |
| CN201307084Y (en) * | 2008-11-06 | 2009-09-09 | 湖南文理学院 | Novel textile fiber moisture testing oven |
| CN202693152U (en) * | 2012-06-21 | 2013-01-23 | 昆山诺科传感器集成有限公司 | Frequency output temperature and humidity transmitter |
-
2012
- 2012-06-21 CN CN201210207326.2A patent/CN102721429B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504671Y (en) * | 2001-07-16 | 2002-08-07 | 复旦大学 | Temp. moisture monitoring circuit device |
| CN1357758A (en) * | 2002-01-11 | 2002-07-10 | 东南大学 | Integrated humidity detector with frequency output |
| CN2570782Y (en) * | 2002-09-27 | 2003-09-03 | 北京农业信息技术研究中心 | Intelligent humiture self-compensation sensing transducer |
| US20050218465A1 (en) * | 2004-04-02 | 2005-10-06 | Timothy Cummins | Integrated electronic sensor |
| CN201035743Y (en) * | 2007-04-03 | 2008-03-12 | 范良凯 | Humiture transducer |
| CN201307084Y (en) * | 2008-11-06 | 2009-09-09 | 湖南文理学院 | Novel textile fiber moisture testing oven |
| CN202693152U (en) * | 2012-06-21 | 2013-01-23 | 昆山诺科传感器集成有限公司 | Frequency output temperature and humidity transmitter |
Non-Patent Citations (2)
| Title |
|---|
| 康赫男: "温湿度变送器输出参数的校准方法", 《计量与测试技术》, vol. 38, no. 8, 30 June 2011 (2011-06-30), pages 36 - 37 * |
| 黄晓琳: "基于HART-HT2012的温/湿度变送器的设计", 《湖北汽车工业学院学报》, vol. 20, no. 3, 30 September 2006 (2006-09-30), pages 32 - 38 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142185A (en) * | 2013-05-10 | 2014-11-12 | 重庆金美通信有限责任公司 | Oil and water temperature collecting circuit for hydraulic retarder |
| CN112557452A (en) * | 2020-12-08 | 2021-03-26 | 安徽信息工程学院 | Combined relative humidity sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102721429B (en) | 2015-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200941076Y (en) | Intelligent pressure, temp displaying control meter | |
| CN102721429B (en) | Frequency-output temperature and humidity transmitter | |
| CN103278196A (en) | Integrated sensor | |
| CN103454004A (en) | Digital multi-point temperature measuring system and achieving method | |
| CN105067492A (en) | Dust concentration meter | |
| CN202693152U (en) | Frequency output temperature and humidity transmitter | |
| CN202372210U (en) | General intelligent converting and conveying device used for industrial sensor | |
| CN102590589A (en) | 4-20mA current transmitter circuit | |
| CN202533482U (en) | 4-20 ma current transmitter circuit | |
| CN104155891B (en) | I＜2＞C-based networked transmitter and communication implementation method thereof | |
| CN203657964U (en) | Pressure transmitter | |
| CN203037609U (en) | Humidity transmitter | |
| CN100451905C (en) | Programmable controller for temperature and humidity | |
| CN201628559U (en) | Multi-parameter intelligent wireless sensor | |
| CN201035743Y (en) | Humiture transducer | |
| CN103900742A (en) | Pressure transmitter | |
| CN204043717U (en) | Explosion-proof intelligent digital displaying meter | |
| CN202814450U (en) | A device for real-time monitoring of temperature and humidity of electronic power modules | |
| CN203443688U (en) | Digital multipoint temperature measurement system | |
| CN202631191U (en) | Pressure meter measuring instrument | |
| CN106092281A (en) | A kind of intelligent electronic-scale system | |
| CN202853691U (en) | Digital input type level transmitter | |
| CN204924262U (en) | Digital changer instrument that shows of LED light beam | |
| CN105511392A (en) | PLC control system used for industrial automation | |
| CN105371899A (en) | Temperature-humidity sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: No. 308 Zhouzhuang Town Park Road in Kunshan city of Suzhou City, Jiangsu province 215325 room 4 Applicant after: Kunshan Nuoke Sensor Integration Co.,Ltd. Applicant after: Beijing Nokisens SAC Co., Ltd. Applicant after: Beijing Nokisens Electronic Technology Development Co., Ltd. Applicant after: Suzhou Zhongyin Sensing Co., Ltd. Applicant after: Weihai Nokisens SAC Co., Ltd. Address before: No. 308 Zhouzhuang Town Park Road in Kunshan city of Suzhou City, Jiangsu province 215325 room 4 Applicant before: Kunshan Nuoke Sensor Integration Co.,Ltd. Applicant before: Beijing Nokisens SAC Co., Ltd. Applicant before: Beijing Nokisens Electronic Technology Development Co., Ltd. Applicant before: Kunshan Nokisens SAC Co., Ltd. Applicant before: Weihai Nokisens SAC Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD. BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD.;BEIJING NOKISENS SAC CO., LTD.;W BEIJING NOKISENS SAC CO. LTD. BEIJING NOKISENS SAC CO., LTD TO: BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD. BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD.;BEIJING NOKISENS SAC CO., LTD.;W SUZHOU ZHONGYIN SENSE CO., LTD. BEIJING NOKISENS SAC CO., LTD |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20200621 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |